Partition or wall.



Patented Dec. 24, l90l. H. E. SHARP.

PABTITlON 0B WALL.

lication filed Nov. 10, 1900.)

(No Model.)

ln venzor HE. Sh arfi hi sAttorneyfi V UNITED STATES PATENT CFFICE.

HARRY E. SHARP, HARTFORD, CONNECTICUT.

PARTITION OR WALL.

SPECIFICATION forming part of Letters Patent No. 689,424, dated December 24, 1901-.

Application filed November 10 1900. Serial No- 36,04.0. (No model.)

T0 at whom it may concern.-

Be itknown that I, HARRY E. SHARP, a citien of the United States, residing in Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Partitions or Walls, of which the following is a specification.

This invention relates to improvements in partitions or walls, and more particularly to the composition and structure of the plasterboard, the principalobject being to provide a plaster-board in which the plastering-material will closely adhere and which will yield and adjust itself thereto and which is also durable and free from oxidation.

In the drawings accompanying and forming part of this specification, Figure 1 is a perspective view of a partly-constructed wall, a portion of the plaster being broken away to show the plaster-board. Fig. 2 is a front elevation of a section of the plaster-board; and Fig. 3 is an end elevation thereof, showing a portion with plaster thereon.

Similar characters of reference indicate corresponding parts in the different figures of the drawings.

It has heretofore been the practice to apply the plaster to boards formed of wood or iron, which while more or less dense and resistive of the moisture of fresh plasterare subject to quite rapid oxidation and also to expansion and contraction. Iron, for example, adheres but weakly to the plaster over its surface, while it is so affected by changes of tem-. perature that the dried plaster is liable to crack and scale off. It is also found in practice to so rapidly rust that in a comparatively short time much will be eaten away, leaving the plaster without proper support. Wood presents but little more adhesiveness than iron, and, moreover, swells from the moisture absorbed from the plaster and from the atmosphere, and then upon drying shrinks and is liable to detach the plaster coat. Wood also in time decays. Then both wood and iron have enough rigidity to be unable to yield or accommodate themselves to the plas ter in a satisfactory manner. To overcome these objections, I provide in the wall A a plaster-board 2, formed in sections and se cured to the furring in the usual manner,

made from the plastic compound or pulp consisting of a preferably fibrous material which is capable of becoming at least slightly softened by the moisture of the freshly-applied plaster of any suitable composition, (shown at 3.) This causes a certain disintegration of the surface of the board and a roughening thereof, the fibrous or other resulting proj ections closely interlocking over the contacting surface with the grains of plaster. the same time some of the gelatinous size which may be used in making the boards is released and adheres to the plaster. This results in a strong adhesion over the entire surface. This plaster board or sheet may be made of any suitable paper board, stock, or pulp and in some cases may be composed of a mixture of paper-board and strawboard, the fibers of the stock being bound together by some suitable adhesive material or sizing, the whole being compressed into the form of a board or sheet. These composition boards are not subject to appreciable expansion, nor do they oxidize.

To further strengthen the engagement between the plaster and the board, plaster-receiving'apertures 4: of any desired size and shape may be provided, into which the plaster will enter. At the roughened edges of these openings the absorption of moisture may be somewhat greater than over the outer surface, and the strength of the union between the coating and the board will tend to be greater, the edges bulging under the weight of plaster and conforming to it.

When my improved plaster-board is made of a material which is by itself combustible,

some substance may, if desired, be introduced into the pulp from which the boards are manufactured which will render them fireproof.

Although the plaster-board is preferably composed of some such fibrous pulp as wood, straw, or other paper stock, it will be seen that evenit' the pulp were granular the par ticles would still interlock with the plaster,

ICO

1. A partition or wall com prisin ga plasterboard of a single thickness composed of a material capable of being softened and disintegrated by moisture, and aplaster coat thereon.

2. A partition or wall comprising a-homogeneous plaster-board composed of a fibrous material capable of being softened and disintegrated by moisture, and a plaster coat thereon.

3. A partition or wall comprising a homo geneous plaster-board composed of a mate rial containing a gelatinous substance or size, capable of being released by moisture, and a plaster coat thereon.

4. A partition or Wall comprising a plasterboard composed of a material capable of being softened and disintegrated by moisture; plaster-receiving apertures therein; and a plaster coat on said board.

5. A homogeneous plaster-board composed of plastic material capable of being affected by the moisture of an exterior coat and having parts thereof interlock with suchexterior coat.

6. A homogeneous plaster-board composed of a material capable of being softened and disintegrated by moisture.

7. A plaster-board of a single thickness disintegrated by moisture, and a fireproofing.

substance.

12. A plasterboard composed of compressed pulp, such as paper or straw; board pulp, capable of being softened and disintegrated by moisture, and containing a gelatinous substance or size also capable of being released by moisture, said board having plas ter-receiving aperturestherein. v

HARRY E. SHARP.

Witnesses:

LEO F. GUETHLEM, WALTER K. PEcK. 

